81260162164009 has 16 divisors (see below), whose sum is σ = 86351171246080. Its totient is φ = 76252546661760.

The previous prime is 81260162163997. The next prime is 81260162164121. The reversal of 81260162164009 is 90046126106218.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 81260162164009 - 2⁷ = 81260162163881 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81260162164009.

It is not an unprimeable number, because it can be changed into a prime (81260162144009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25989012 + ... + 28947349.

It is an arithmetic number, because the mean of its divisors is an integer number (5396948202880).

Almost surely, 2^{81260162164009} is an apocalyptic number.

It is an amenable number.

81260162164009 is a deficient number, since it is larger than the sum of its proper divisors (5091009082071).

81260162164009 is a wasteful number, since it uses less digits than its factorization.

81260162164009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54937120.

The product of its (nonzero) digits is 248832, while the sum is 46.

The spelling of 81260162164009 in words is "eighty-one trillion, two hundred sixty billion, one hundred sixty-two million, one hundred sixty-four thousand, nine".